From 5a276985c27862441a9ddc3a2b06e8a53f47f059 Mon Sep 17 00:00:00 2001
From: Howard Chen <howardsoc@google.com>
Date: Thu, 18 Feb 2021 20:14:05 +0800
Subject: [PATCH] Support cuttlefish with an emulated 2GB SD

Currently we have an assumption that SD card's size is bigger
than the internal /data so the DSU would  always choose SD as the
destination when possible. This assumption is not valid for
cuttlefish which only have an emulated 2G SD

Bug: 179980369
Bug: 171861574

Test: A physical device with a SD card inserted and
      CF local instance with an emulated SD

Change-Id: I15c5d38ab316b8d65546d876fe235d0c9c6ed6aa
---
 .../java/com/android/server/DynamicSystemService.java    | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/services/core/java/com/android/server/DynamicSystemService.java b/services/core/java/com/android/server/DynamicSystemService.java
index 88ce2208adcb5..e29e894a5cc00 100644
--- a/services/core/java/com/android/server/DynamicSystemService.java
+++ b/services/core/java/com/android/server/DynamicSystemService.java
@@ -28,6 +28,7 @@ import android.os.ServiceManager;
 import android.os.SystemProperties;
 import android.os.UserHandle;
 import android.os.image.IDynamicSystemService;
+import android.os.storage.DiskInfo;
 import android.os.storage.StorageManager;
 import android.os.storage.VolumeInfo;
 import android.util.Slog;
@@ -40,6 +41,7 @@ import java.io.File;
  */
 public class DynamicSystemService extends IDynamicSystemService.Stub {
     private static final String TAG = "DynamicSystemService";
+    private static final long MINIMUM_SD_MB = (30L << 10);
     private static final int GSID_ROUGH_TIMEOUT_MS = 8192;
     private static final String PATH_DEFAULT = "/data/gsi/";
     private Context mContext;
@@ -95,6 +97,13 @@ public class DynamicSystemService extends IDynamicSystemService.Stub {
                 if (!volume.isMountedWritable()) {
                     continue;
                 }
+                DiskInfo disk = volume.getDisk();
+                long mega = disk.size >> 20;
+                Slog.i(TAG, volume.getPath() + ": " + mega + " MB");
+                if (mega < MINIMUM_SD_MB) {
+                    Slog.i(TAG, volume.getPath() + ": insufficient storage");
+                    continue;
+                }
                 File sd_internal = volume.getInternalPathForUser(userId);
                 if (sd_internal != null) {
                     path = new File(sd_internal, dsuSlot).getPath();